Destroy the session after logout

This is the fix for defect 8008
Set allowScriptAccess attribute as never

This should be a temporary solution for this security defect, we are going to make some formal fix on this in the future.
Merge pull request #81 from cloudfoundry-incubator/allowscriptaccess_issue

Set allowScriptAccess attribute as never
Merge pull request #80 from cloudfoundry-incubator/change_session_id

Destroy the session after logout
gave a permanent fix to the security issue of allowScriptAccess in ZeroClipboard.js

Changed allowScriptAccess' value from never to sameDomain
Merge pull request #82 from cloudfoundry-incubator/allowScriptAccess_set_to_never_s8009

gave a permanent fix to the security issue of allowScriptAccess in ZeroC...
Revert "Set allowScriptAccess attribute as never"

This reverts commit f2a600409108d4b9b05b85745358423e4ee43361.
Merge pull request #83 from cloudfoundry-incubator/revertTemporaryAllowScriptAccessFix

Revert "Set allowScriptAccess attribute as never"